text: var webPush = require('web-push')
  
  const vapidKey = {
      "publicKey": "BC8ot3ieZFmDM97_pnocyklWRTIwKkkRGaHLegrpVeoswxVsmUbSyD5oMCLhTXTGKDPcBlZh0dg2a3DzD7gX1kE",
      "privateKey": "zem1rNAyowKlAVLbqCvFLA9XbCDeBI-ZdlZHMYEMfrA"
  }
  
  webPush.setVapidDetails(
      'mailto:example@yourdomain.org',
      vapidKey.publicKey,
      vapidKey.privateKey
  )
  var pushSubscription = {
      "endpoint": "https://fcm.googleapis.com/fcm/send/fJ1d3_9fYxw:APA91bErJlKQ0Js__6izFZxhCH1gAcvcnByO1eXi0i3s3Aof_bx6wRjW5i6SII2yJrC4C8eAOICq6EEW9rApRNQ4Wb_1EjAc5L7xZ-JSO5eWX43A9FA0NKriAzP6k9JmPaAfoKbO13Yb",
      "Keys": {
          "p256dh": "BE8l/VfIWK+PjkWVFJkE3RktBTM8J69mK2XcDKcRhxpNVS18+bP8OQFbzMucJ9uzkpD9JmCT1gh3CL9jMLhQTSY=",
          "auth":  "i3m03e1gzaaMGeHCuiJNfQ=="
      }
  }
  var payload = 'Selamat! Aplikasi anda sudah dapat menerima push notifikasi!';
  
  var options = {
      gcmAPIKey: "184073159235",
      TTL: 60
  }
  webPush.sendNotification(
      pushSubscription,
      payload,
      options
  )